The NEC, also called NFPA 70, is the benchmark standard for electrical safety in residential, commercial, and industrial wiring in the United States. It is updated every 3 years by the National Fire Protection Association.

These tests are based on the 2023 NEC. Older editions (2017, 2020) are still in use in some jurisdictions — check your state to confirm which edition applies to your exam.

Each question on this site shows the relevant NEC article (e.g., "NEC 310.15(B)(16)"). Look up that article in your NEC code book for the full text and surrounding context.

No. Practice tests reinforce your understanding of the rules. You still need an up-to-date NEC code book for the actual exam and for professional reference.